Have you ever had your phone switched on while on a plane? I have, more than once. Above about 8,000 feet it tends to be almost impossible to get a signal anyw

Have you ever had your phone switched on while on a plane? I have, more than once. Above about 8,000 feet it tends to be almost impossible to get a signal anyway. Most cell towers have a lot of RF engineering put into them to direct the signals DOWN, not UP.